Insulated support for electrical conductors



Oct. 6, 1925. I

L. STEINBERGER ET AL INSULATED SUPPORT FOR ELECTRICAL CONDUCTORS Filed April 26 i922 2 Sheets-Sheet 1 Oct. 6, 1925-- 1,555,954

' L. STEINBERGER E! AL INSULATED SUPPORT FOR ELECTRICAL CONDUCTORS Filed April 26, 1922 2- Sheets-Sheet 2 Patented Oct. 6, 1925.

UNITED STATES PATENT OFFICE.

LOUIS .STEINBERGER, OF BROOKLYN, NEW YORK, AND GUY BILL, OF WASHINGTON, DISTRICT OF COLUMBIA.

INSULATED SUPPORT FOR ELECTRICAL CONDUCTORS.

Application filed April 26, 1922. Serial No. 556,641.

To all whom it may concern:

Be it known that we, LOUIS STEINBERGER and GUY HILL, citizens of the United States, and residents, respectively, of the borough of Brooklyn, city and State of New York, and Washington, District of Columbia, have jointly invented certain new and useful Improvements in Insulated Supports for Electrical Conductors, of which the following is a specification.

This application covers an improved method' of constructing a coil similar to that covered by our pending patent application Number 384,950 filed May 28, 1920.

Our invention relates particularly to insulated inductance coil for use with currents of high frequency and high potential, and it is especially adopted for use in radio apparatus. One of the objects of our invention is to provide an inductance coil with an insulated support therefor, said coil being secured to the insulating body in such a manner as to have a minimum amount of insulated material extending from one turn to the next whereby the di-electric loss in the insulated material is reduced to a minimum.

Another object of our invention is to provide a mounting of insulating material for insulating the coil, said coil being secured to the insulating body in such fashion that as much of the coil as possible is exposed to the air for the purpose of affording a rapid means for the radiation of any heat generated in the coil.

Another object is to combine a mounting of insulating materisi with an inductance coil in such fashion as to secure the coil rigidly to the insulating material at a single moulding operation, using a minimum amount of insulation between the turns of the coil, and having the coil exposed to the air as much as possible.

Another object of our invention is to provide a simple efficient inductance coil for the use of high frequency, high tension currents which is easy and inexpensive to manufacture and which has satisfactory mechanical strength and high electrical efficiency.

Another object of our invention is to provide a simple and eflicient induction coil for use in any installation which may be de- Other objects will appear from the specifications and claims.

Referring to the drawings, in which the same reference character indicates the same part in the several views:

Figure 1 is a plan view showing one form of this invention.

AFilgure 2 is a section of Figure 1 on line Figure 3 shows a form similar to Figure 1 except that portions of the insulating material have been omitted.

Fig. 4 is another form of the invention in which certain further portions of the insulation have been omitted.

Figure 5 shows a section of Figure 4 on the line BB, and

Figure 6 shows a method that can be used for securing the copper strip to the insulating material for any of the Figures 1, 3 or 4.

Having more particular reference to Figure 1, 1 indicates a plate of insulating material. 2 represents a spiral ridge of insulating material extending above the upper surface of the plate. 3 represents a spiral metal conductor, such as copper, secured to the insulating ridge 2. 4 represents the hole in the center of the insulating disc. 5 represents a metal bushing secured to the insulating plate 1. This metal bushing 5 can have a gap 6 if desired. The metal bushlng 5 is of advantage in case it is desired to use a revolving arm to make contact along the coil, in which case, the bushing 5 will serve as a bearing for the shaft operating the revolving arm. 7 represents holes in the corners of insulating plate if desired. In place of hole 7 through the insulating material, bushing similar to 5 can be employed if desired for greater mechanical strength. As

this bush'lng will be secured in a similar manner to 5, it is not considered necessary to show it in the drawing. The portion of the insulating plate surrounding the bushing 5, indicated by 10, can be thinner thanthe outer portion of the plate indicated by 9, if desired, the difi'erent thicknesses being illustrated in Figure 2.

Referring to Figure 2, 2' re resents the form of the insulating material etween two adjacent turns. It will be noted that the shortest path from anyone turn 3, to any adjacent turn 3, through the insulating material, is considerably longer than the distance separating the adjacent turns. By this means any di-electric loss which may take place in the insulator due to a difierence of potential between two adjacent turns, is reduced to a minimum, as the path through the insulation is comparatively long. Also, if the insulation is made in the form shown in Figure 2, the cross section of insulation between any two adjacent turns is small, which will reduce not only the di-electric loss, but the capacity effect between any two turns, the reduction of this capacity effect being of considerable importance in radio apparatus. The bottom of the insulation between the turns 3 as indicated by 2, is above the bottom of the insulating plate indicated by line 8, so that if the coil, during manufacture and handling, is rested on surface 8, there will be no danger of injury to the bottom of the insulating grooves 2, as they would not come in contact with any fiat surface on which the coil might rest. The section of the outer portion of the plate, as indicated by 9, can be made thicker than the central portion indicated by 10 surrounding the bushing 5 for mechanical reasons, if desired.

In Figure 3 instead of a continuous spiral ridge of insulating material, such as 2 in Figure 1, there is a ridge 11 which is the same as 2 except that portions of the plate indicated by 13 have been cut away so that the ridge 11 is broken up into sections, the inner portion of this ridge indicated by 12 being continuous for approximately one-half turn. A-A represents a section which Wlll be the same as section A--A of Figure 1, which is shown in Fi ure 2. The sections of the plate 1 and insu ating ridge 11 which are cut away make the entire structure of less weight and also reduce the total amount of insulation between the turns of the coil, also opening 13 forms an additional means for makin connection to the lower portion of the con ucting strip 3.

Referring to Figure 4, 15 represents sections of the spiral insulating ridge. 16 represents positions on plate 1" where the spiral ridge has been omitted. 16' represents specifically one such position, the arrangement being more clearl indicated by reference to Figure 5 whic is a section along the line BB of Figure 4. Figure 4 is thus similar to Figure 3 except for the omission of portions of insulating ridge 11 of Figure 3 as indicated at positions 16 on Figure 4. That is, in Fi ure 4 not only has insulation been omitted y cutting out sections of the plate indicated by 14, but also sections of the insulating ridge 15 have been omitted. These sections have been omitted in such a manner that where the coil is secured to insulating material, such insulating material only is used on every alternate turn.

Figure 5 represents a section of Figure 4 on the line BB. In this section three turns of the copper strip are shown. The two outside turns are secured to insulating ridges 15 while the inner turn is not secured to any insulation material. In Fig. 4, 16 represents the same conditions as 16, 16' merely representing one specific 16 as shown in Fig. 5. In Fig. 5 the inner turn is not shown supported; by referring to Fig. 4 it is seen that this turn is supported by sections of spiral insulating ridges indicated by 18 and 19. 18 and 19 are the same as sections indicated by 15 but are different designating numbers in order to make the description clearer.

Figure 6 re resents a method by which the copper strip 3 can be secured to the insulating ridge 2 by making grooves in the copper coil 3, indicated by 20 and 21, the method shown in Figure 6 being applicable to any of the Figures 1, 2, 3, 4 or 5.

In addition to securing the copper strip to the insulating material as shown in Fig ure 6, any other equivalent method can be used such as roughing the surface of the 00 per.

aving described the invention, what is claimed and desired to be secured by Letters Patent is:

1. In a device of the kind described, a spiral inductance coil and an insulating support for said coil comprising a raised spiral portion of insulating material in which said coil is partially embedded to permit its upper and lower edges to be exposed the path through the insulation between each turn being substantially greater than the actual distance between the same turns.

2. In a device of the kind described, a spiral inductance coil and a support of insulating material having raised portions in the form of a broken spiral in which said spiral coil is partially embedded to permit its edges to extend from the surfaces of the raised portions the path through the insulation for one turn to the next being greater than the actual distance between the same turns.

3. A device of the kind described which comprises a spiral inductance coil and a support of insulating material for said coil having a raised portion in the form of a spiral supporting said inductance coil said coil being exposed upon each side of the support, said raised spiral and intervening portions of said insulating material being thinner than the base or supporting portion of said material.

4. A device of the kind described which comprises a body of insulating material having rasied spiral portions and a spiral inductance coilmounted in the ridges of said raised portions and having its upper and lower edges exposed. said insulator providing an extensive surface and small quantity of 1material between adjacent turns of said (301 5. A device of the kind described which comprises a body of insulating material having a relatively thin portion formed into a raised spiral portion and intervening troughs, said raised and trough portions being entirely above the bottom surface of said body of insulating material, and a spiral inductance coil molded in the ridge of said raised spiral portion of said insulating material and having its upper and lower edges exposed.

6. A device of the kind described which comprises, a spiral ribbon conductor, a spiral section of insulating material between the turns of said spiral ribbon, said section of insulating material permitting the edges of said spiral ribbon toproject from the surfaces thereof, said insulating section being sinuous in radial cross section between the turns of said conductor the path throu h the insulation between each turn being suhstantially greater than the actual distance between the same turns,

7. A device of the kind described which comprises a body of insulating material having a raised spiral portion and openings extending through said spiral portions, and a spiral inductance coil mounted in said raised portions and spanning said openings.

8. A device of the kind described which comprises a spiral coil of metallic ribbon and a body of insulating material having raised, thinned, portions molded to the median portion of said ribbon at intervals of its length and having openings formed below portions of said coil.

Signed this 19th day of April, 1922.

LOUIS STEINBERGER.

Signed this 24th day of April, 1922.

GUY HILL. 

